Signal Processing Apparatus for Abrupt Change Detection
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Solution Overview
Problem
Existing signal detection techniques, such as those described in patent literature 1 and 2, are ineffective in accurately detecting abrupt changes in signals due to limitations in measuring frequency changes and phase equalization processing.
Innovation Solution
A signal processing apparatus and method that converts an input signal into a phase component signal in the frequency domain, calculates first and second phase gradients, and determines the presence of abrupt changes based on these gradients, allowing for effective detection of signal changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If frequency fluctuation measurement is used to detect abrupt changes, then frequency changes can be identified, but abrupt signal changes cannot be effectively detected
Solution Approach 1:
The invention changes the detection parameter from frequency domain (frequency fluctuation) to phase domain (phase gradient). By calculating the phase gradient of the input signal and comparing it with a reference phase gradient, the system can effectively detect abrupt changes that were invisible to frequency-based methods. This parameter transformation resolves the contradiction by making abrupt changes detectable while maintaining frequency change detection capability through the phase-frequency relationship.
2Stability of the object's composition
If phase equalization processing is performed using phase gradient, then phase linearization is achieved, but abrupt signal changes remain undetected
Solution Approach 1:
The invention segments the phase gradient analysis into two distinct components: a reference phase gradient (representing normal/expected behavior) and a detected phase gradient (from the actual signal). By comparing these segmented components, the system can identify deviations that indicate abrupt changes. This segmentation allows the system to maintain phase stability through equalization while simultaneously detecting abrupt changes that deviate from the reference pattern.
Solution Approach 2:
The reference phase gradient acts as an intermediary between the phase equalization process and abrupt change detection. Instead of directly detecting abrupt changes from the raw phase signal, the system uses the reference phase gradient as a mediator to compare against the actual phase gradient. This intermediary enables the system to distinguish between normal phase variations (handled by equalization) and abnormal abrupt changes (detected through comparison).
Data Source
AI summary
This invention enables to effectively detect an abrupt change in a signal. The signal processing apparatus includes a converter that converts an input signal into a phase component signal in a frequency domain, a first calculator that calculates a first phase gradient as a gradient of the phase of the phase component signal, a second calculator that calculates a second phase gradient using the first phase gradients at a plurality of frequencies, and a determiner that determines existability concerning an abrupt change in the input signal based on the first phase gradients and the second phase gradient.